Attempts at predicting when and where earthquakes will occur have met with some success in recent years. Researchers have been able to use instruments such as seismographs, to find out the source of where seismic waves were produced. This allows the researchers to further study and eventually make accurate predictions about a coming earthquake and the damage it will bring. At present, China, Japan, Russia, and the United States are the countries most actively supporting such research. Other potential clues being investigated are tilting or bulging of the land surface and changes in the earth's magnetic field, in the water levels of wells, and even in animal behavior. A new method under study in the United States involves measuring the buildup of stress in the crust of the earth.
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